Abstract
Design types of the stripe-geometry heterojunction laser are reviewed. Various methods for providing an electrical confinement, and/or optical confinement, are explained. The strong lateral confinement is shown to be important to stabilize the lasing filament in the cavity. Planar stripe-geometry lasers (without strong lateral optical confinement) have sometimes anomalous light output characteristics, containing “kinks”, discontinuities, or hysteresis loops. These irregularities are discussed in terms of optical nonlinear (self-focusing) mechanism. Problems of the electrical characterization of the continuously operating stripe-geometry lasers are considered.
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